They may not be everywhere, but hackers did get into Backbar’s website this past weekend.

By Jim Clark

Staff and visitors to the website of Backbar, a Union Square drinking establishment, got quite a shock on Saturday when they pulled up its homepage only to discover that the site had been hacked with a message purportedly placed there by the extremist group ISIS.

The proprietors of Backbar confirmed that the site had been compromised and an image put on the homepage that stated “Hacked by Islamic State – we are everywhere.”

Investigators said that they have no direct evidence that the hack was carried out by the Islamic State, and that it might be the work of a prankster seeking public attention.

A number of similar “virtual graffiti” incidents have occurred across the country involving various businesses and organizations.

Backbar’s website was restored to its former state, and its staff is cooperating with the FBI in its ongoing investigation into the matter.